[Python-checkins] cpython (3.2): Issue #18747: document issue with OpenSSL's CPRNG state and fork

georg.brandl python-checkins at python.org
Tue Sep 30 14:46:58 CEST 2014

changeset:   92661:bdf73458df5f
branch:      3.2
user:        Christian Heimes <christian at cheimes.de>
date:        Tue Oct 29 21:08:56 2013 +0100
  Issue #18747: document issue with OpenSSL's CPRNG state and fork

  Doc/library/os.rst  |  4 ++++
  Doc/library/ssl.rst |  8 ++++++++
  2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/Doc/library/os.rst b/Doc/library/os.rst
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1809,6 +1809,10 @@
    Note that some platforms including FreeBSD <= 6.3, Cygwin and OS/2 EMX have
    known issues when using fork() from a thread.
+   .. warning::
+      See :mod:`ssl` for applications that use the SSL module with fork().
    Availability: Unix.
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -28,6 +28,14 @@
    operating system socket APIs.  The installed version of OpenSSL may also
    cause variations in behavior.
+.. warning::
+   OpenSSL's internal random number generator does not properly handle fork.
+   Applications must change the PRNG state of the parent process if they use
+   any SSL feature with with :func:`os.fork`. Any successful call of
+   :func:`~ssl.RAND_add`, :func:`~ssl.RAND_bytes` or
+   :func:`~ssl.RAND_pseudo_bytes` is sufficient.
 This section documents the objects and functions in the ``ssl`` module; for more
 general information about TLS, SSL, and certificates, the reader is referred to
 the documents in the "See Also" section at the bottom.

Repository URL: https://hg.python.org/cpython

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